Why do male birds with long tails seem attractive to females of many species?

Question

Why do male birds with long tails seem attractive to females of many species?​

Quizplus · Accepted Answer

Male birds with long tails are often seen as attractive by females because a long tail is a sign of good health and genetic quality. It is believed that only healthy males are able to grow and maintain such long and elaborate tails. Therefore, females who choose a male with a long tail have a better chance of producing healthy offspring, improving the fitness of their offspring.

Why Do Male Birds with Long Tails Seem Attractive to Females